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The Long Term Stable (LTS) Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains the JCA/JCE provider and low-level API for the BC LTS version 2.73.7 for Java 8 and later.

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package org.bouncycastle.crypto;

/**
 * With FIPS PUB 202 a new kind of message digest was announced which supported extendable output, or variable digest sizes.
 * This interface provides the extra method required to support variable output on an extended digest implementation.
 */
public interface Xof
    extends ExtendedDigest
{
    /**
     * Output the results of the final calculation for this digest to outLen number of bytes.
     *
     * @param out output array to write the output bytes to.
     * @param outOff offset to start writing the bytes at.
     * @param outLen the number of output bytes requested.
     * @return the number of bytes written
     */
    int doFinal(byte[] out, int outOff, int outLen);

    /**
     * Start outputting the results of the final calculation for this digest. Unlike doFinal, this method
     * will continue producing output until the Xof is explicitly reset, or signals otherwise.
     *
     * @param out output array to write the output bytes to.
     * @param outOff offset to start writing the bytes at.
     * @param outLen the number of output bytes requested.
     * @return the number of bytes written
     */
    int doOutput(byte[] out, int outOff, int outLen);
}